style: adopt ruff (format + lint) at 88, replacing black/isort/flake8

Format-only: Python files are AST-identical apart from import order.
pre-commit end-of-file/trailing-whitespace fixes applied repo-wide.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/superpowers/plans/2026-10-04-modernization-hotfix-track.md

@@ -160,7 +160,9 @@ def norm(src):
     tree = ast.parse(src)
     imports, rest = [], []
     for node in tree.body:
-        (imports if isinstance(node, (ast.Import, ast.ImportFrom)) else rest).append(node)
+        (imports if isinstance(node, (ast.Import, ast.ImportFrom)) else rest).append(
+            node
+        )
     for node in imports:
         node.names = sorted(node.names, key=lambda a: (a.name, a.asname or ""))
     return sorted(ast.dump(n) for n in imports), [ast.dump(n) for n in rest]
@@ -876,8 +878,7 @@ import pytest  # add to the imports
 
 
 @pytest.mark.skipif(not VERIFY_SCRIPT.exists(), reason="added with the release task")
-def test_verify_script_covers_matrix():
-    ...
+def test_verify_script_covers_matrix(): ...
 ```
 Run again. Expected: all pass, 1 skipped.